Study of optical non-linearity from structural perspective in Rhodamine using z-scan technique co-related to luminescence spectroscopy
Molecular structures of dyes differ with substituent and can result in different forms of a dye. For instance, Rhodamine gives Rh 6G, Rh B, Rh 123, Rh 110, etc., with varying properties that depend on the substituent. Most studies in the literature on optical non-linearity of dyes overlook the effec...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Chemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715625005971 |
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| Summary: | Molecular structures of dyes differ with substituent and can result in different forms of a dye. For instance, Rhodamine gives Rh 6G, Rh B, Rh 123, Rh 110, etc., with varying properties that depend on the substituent. Most studies in the literature on optical non-linearity of dyes overlook the effect of substituent/molecular structure on non-linearity and confine their investigations to the dependence of non-linear properties on concentration of dyes, solvents, wavelength and intensity of the interacting laser. In this study, the effect of substituent on optical cubic non-linearity is demonstrated through a comparative investigation in Rh 6G and Rh B using the single beam z-scan technique, with an incident laser beam intensity I0 = 7.83 kW/cm2 and wavelength 532 nm. The closed aperture (CA) and open aperture (OA) z-scans of aqueous solutions of Rh 6G and Rh B are strikingly different. Variations in the results are analysed from a structural perspective and non-linear refractive index (n2), non-linear absorption coefficient (β) and optical third-order susceptibility χ3 of the dyes are calculated. The present study also examines the non-linearity in Rh 6G and Rh B in correlation to their fluorescence and up-converted emission. The possibility of quintet non-linearity in Rh 6G and Rh B is indicated for interactions with intense 1000 nm wavelength. |
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| ISSN: | 2211-7156 |